minecraft-assets/assets/minecraft/models/block/vault_unlocking_ominous.json

{
  "parent": "minecraft:block/template_vault",
  "textures": {
    "bottom": "minecraft:block/vault_bottom_ominous",
    "front": "minecraft:block/vault_front_ejecting_ominous",
    "side": "minecraft:block/vault_side_on_ominous",
    "top": "minecraft:block/vault_top_ominous"
  }
}